Parametric attosecond pulse amplification far from the ionization threshold from high order harmonic generation in He${}^{+}$

C. Serrat, J. Seres, E. Seres +4

Parametric amplification of attosecond coherent pulses around 100 eV at the single-atom level is demonstrated for the first time by using the 3D time-dependent Schr{ö}dinger equati…